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BLEACHED CORAL, VALERIE RESTARICK

Global warming is one of the major causes of coral reef bleaching. Abnormally high sea temperatures kill the tiny marine algae that are essential to coral health. In Australia, a recent aerial survey has shown that 95% of the northern Great Barrier Reef is bleached - far worse than previously thought. Of the 520 reefs surveyed only four showed no evidence of bleaching. It is estimated that 60% of the world's coral reefs will be lost by 2030.